The army said its aircraft hit radical Islamists near Sinai's border with the Gaza Strip on Friday evening. A statement described them as belonging to the Muslim Brotherhood, which denies government accusations it has turned to violence.
The army has been trying to wrestle control of North Sinai from armed Islamists who have turned their focus from Israel to the government since Morsi, a Brotherhood member, was deposed in July following mass protests against his rule.
The state has declared the Brotherhood a terrorist group. The Brotherhood says it is committed to peaceful activism.